This is a way to avoid interfacing the top portion of a patch pocket, by using an extra layer of self-fabric. (Front bands on shirts are sometimes made this way.)

Pocket patterns typically have a portion on the top that is folded over to form a facing - and is also interfaced. On the pocket pattern (click here), add on another section above that, the same size. Then fold it over to the inside to form the interfacing. Then construct the pocket as usual, folding the top section to the outside and stitching on the seamlines, then turning this back to the inside (click here). You don't need to finish the bottom edge of the facing, but you will probably want to topstitch it down.

In most cases, the extra layer of fabric provides plenty of support so that you don't need any interfacing. On very soft fabrics, or if the print would show through, you'd be better off using interfacing.